Flexible sheet resistance.



No. 819,654. PATENTED MAY 1, 1906.

H. E. HEATH. FLEXIBLE SHEET RESISTANCE.

APPLICATION FILED DEG. 12, 1904.

wltnesses Inventor.

// Harry E. I-ieath; W bg My;

I UNITED srArss- I HARRY PATENT oinrion ELECTRIC COMPANY, A CORPORATIONOF NEW YORK.

, FLEXIBLE SHEET RESISTANCE.

To all whom it may concern Be it known that I, HARRY E. HEATH, a citizenof the United States, residing at Lynn, county of Essex, State ofMassachusetts, have invented certain new and useful Improveinents inFlexible Sheet Resistances, of whichthe following is a specification.-

.- ;and retained in that form by electrical com This invention relatesto electrical resistance material, and has for its object the provisionof a resistance fabric that may readily.

of refractory insulating material, preferably of vitreous character,such as glass, porcelain, or earthenware. These beads 'or but. tons areformed into a fabric and supported ductors. The beads are slotted toreceive the conductor, and the contacting of the adjacent beads witheach other revents shortcircuiting of the conductor, W 1c the roundedcorners of the beads permit them to slip i the cylinder shown in Fig. 4.

ast each other, so as to render the fabric Specification of LettersPatent. I

, Application filed December 12, 1904. Serial No. 236,457.

Batented May 1, 1906.

coated with enamel and may vary in shape. I arran e these buttons incolumns in coning portions of the buttons of one row being in theadjacent row. An electrical conductor 2 is arranged to enga e theslotted portions of the buttons, so t at when the conductor is drawntaut the buttons are in conto slip past each other to form a flexiblefabr1c.

In Figs. 4 and 5 I have shown a cylinder constructed from the same kindof buttons as those of Fig. 1, the cylinder being developed in Fig. 5.The buttons themselves are made, as shown in Fig. 3, with a flat hole 3and one side 4, cut away sufiiciently to permit the conductor to passthrough it and into the hole 3:. I have shown the button in Fig. 3as.made of metal with its surface 5 enameled. This makes a very chea andefficient construction, for very little arm could be done b the chi pingof the enamel, unless it cl iipped undbr both wires, in which case onlyone turn of the conductor would be shortcircuited. By this constructionany bead exible... This construction permits of. the may be removed andanother substituted fabric being made into any desired form and may besewed between cloth covers or held in felt for a heating-pad. The beadsare slotted, so as to make them readily detachable and to make itunnecessary to thread the conductor through the beads, which, especiallyin the case of a very long conductor, is very undesirable. I

In the drawings 1 have illustrated various methods of carryin out myinvention, while the claims I appended hereto indicate the S00 ethereof.

n the drawings, Figure 1 isa plan view of one form of my insulatingfabric; Fi .2 is an end view thereof. Fig. 3 is an en arged view of oneof the beads shown in Figs. 1 and 2. Fig. 4 shows the fabric made into acylindrical form, and Fig. 5 is a development of Referring to thedrawings, the fabric is com osed of beads 1, made c-shaped of some goorefractory insulating material, preferably of a vitreous character, suchas lass, porcelain, or earthenware. They may, owever, be made of slate,wood, or of metal therefor Without disturbing the others. Thisconstruction also permits the use of long lengths of Wire, which is notpirmissible where the conductor is threaded ough the button.

A fabric formed of insulatin buttons, as

herein described, will withstan a high heat and prevent short circuitswhen the conductor runs hot, as'is frequently necessary in electricheaters. The beads are very strong and will withstand rough usage. As aresistance medium I may use any approved wire, satisfactory resultshaving been ob-- tained with Climax wire, being a nickelsteel compound,and with Advance wire or nickel-co per.

What claim as new, and desire to secilre 1. A resistance unit comprisinga sheet of ,buttons having an electrical conductor running therethrough,and means whereby any the unit without remo -1g any of the others.

2. A resistance fabric comprisin a plurality of rows of insulatingaperture buttons tact wit each other, as shown, the contact v oppositethe slotted portions of the buttons by Letters Patent of the UnitedStates, is-- E. HEATH, or LYNN, MASSACHUSETTS, ASSIGNOR 'ro, GENERALtact, while their rounded edges permit them one of said buttons ma bedetached from I having one face slotted to admit a conductor to theaperture, and an electrical conductor running through said aperture.

3. A resistance fabric comprising a plurality of rows of insulatingapertured buttons having one face slotted to admit a conductor to theaperture, and an electrical conductor running through said aperture,said conductor engaging each its interior Wall.

4. A resistance fabric comprising a plurality of rows of insulatingapertured buttons having one face slotted to admit a conductor to theaperture, and a continuous electrical conductor running through saidaperture,

button on opposite sides of said conductor engaging each button onopposite sides of its interior Wall.

5. A resistance fabric composed of a plurality of rows ofinsulating-buttons, and an electrical conductor in engagement with saidbuttons, and means whereby any one of said buttons may be removed fromsaid engagement Without removing any of the others.

In witness whereof I have hereunto set my hand this 9th day of December,1904.

HARRY E. HEATH.

